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diff --git a/src/filecache.c b/src/filecache.c
--- /dev/null
+++ b/src/filecache.c
@@ -0,0 +1,398 @@
+#define _XOPEN_SOURCE 500
+
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <pthread.h>
+
+#include <ne_props.h>
+#include <ne_uri.h>
+#include <ne_session.h>
+#include <ne_utils.h>
+#include <ne_socket.h>
+#include <ne_auth.h>
+#include <ne_dates.h>
+#include <ne_basic.h>
+
+#include "filecache.h"
+#include "fusedav.h"
+#include "session.h"
+#include "statcache.h"
+
+struct file_info {
+ char *filename;
+ int fd;
+ off_t server_length, length, present;
+
+ int readable;
+ int writable;
+
+ int modified;
+
+ int ref, dead;
+
+ pthread_mutex_t mutex;
+
+ /* This field is locked by files_mutex, not by file_info->mutex */
+ struct file_info *next;
+};
+
+static struct file_info *files = NULL;
+static pthread_mutex_t files_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+int file_cache_sync_unlocked(struct file_info *fi);
+
+void* file_cache_get(const char *path) {
+ struct file_info *f, *r = NULL;
+
+ pthread_mutex_lock(&files_mutex);
+
+ for (f = files; f; f = f->next) {
+
+ pthread_mutex_lock(&f->mutex);
+ if (!f->dead && f->filename && !strcmp(path, f->filename)) {
+ f->ref++;
+ r = f;
+ }
+ pthread_mutex_unlock(&f->mutex);
+
+ if (r)
+ break;
+ }
+
+ pthread_mutex_unlock(&files_mutex);
+ return f;
+}
+
+static void file_cache_free_unlocked(struct file_info *fi) {
+ assert(fi && fi->dead && fi->ref == 0);
+
+ free(fi->filename);
+
+ if (fi->fd >= 0)
+ close(fi->fd);
+
+ pthread_mutex_destroy(&fi->mutex);
+ free(fi);
+}
+
+void file_cache_unref(void *f) {
+ struct file_info *fi = f;
+ assert(fi);
+
+ pthread_mutex_lock(&fi->mutex);
+
+ assert(fi->ref >= 1);
+ fi->ref--;
+
+ if (!fi->ref && fi->dead) {
+ file_cache_sync_unlocked(fi);
+ file_cache_free_unlocked(fi);
+ }
+
+ pthread_mutex_unlock(&fi->mutex);
+}
+
+static void file_cache_unlink(struct file_info *fi) {
+ struct file_info *s, *prev;
+ assert(fi);
+
+ pthread_mutex_lock(&files_mutex);
+
+ for (s = files, prev = NULL; s; s = s->next) {
+ if (s == fi) {
+ if (prev)
+ prev->next = s->next;
+ else
+ files = s->next;
+
+ break;
+ }
+
+ prev = s;
+ }
+
+ pthread_mutex_unlock(&files_mutex);
+}
+
+int file_cache_close(void *f) {
+ struct file_info *fi = f;
+ int r = 0;
+ assert(fi);
+
+ file_cache_unlink(f);
+
+ pthread_mutex_lock(&fi->mutex);
+ fi->dead = 1;
+ pthread_mutex_unlock(&fi->mutex);
+
+ return r;
+}
+
+void* file_cache_open(const char *path, int flags) {
+ struct file_info *fi;
+ char tempfile[PATH_MAX];
+ char *length = NULL;
+ ne_request *req;
+ ne_session *session;
+
+ if ((fi = file_cache_get(path))) {
+ if (flags & O_RDONLY || flags & O_RDWR) fi->readable = 1;
+ if (flags & O_WRONLY || flags & O_RDWR) fi->writable = 1;
+ return fi;
+ }
+
+ if (!(session = session_get())) {
+ errno = -EIO;
+ return NULL;
+ }
+
+ fi = malloc(sizeof(struct file_info));
+ memset(fi, 0, sizeof(struct file_info));
+ fi->fd = -1;
+
+ fi->filename = strdup(path);
+
+ snprintf(tempfile, sizeof(tempfile), "%s/fusedav-cache-XXXXXX", "/tmp");
+ if ((fi->fd = mkstemp(tempfile)) < 0)
+ goto fail;
+ unlink(tempfile);
+
+ req = ne_request_create(session, "HEAD", path);
+ assert(req);
+
+ ne_add_response_header_handler(req, "Content-Length", ne_duplicate_header, &length);
+
+ if (ne_request_dispatch(req) != NE_OK) {
+ fprintf(stderr, "HEAD failed: %s\n", ne_get_error(session));
+ errno = ENOENT;
+ goto fail;
+ }
+
+ if (!length) {
+ fprintf(stderr, "HEAD did not return content length.\n");
+ errno = EPROTO;
+ goto fail;
+ }
+
+ fi->server_length = fi->length = atoi(length);
+
+ ne_request_destroy(req);
+ free(length);
+
+ if (flags & O_RDONLY || flags & O_RDWR) fi->readable = 1;
+ if (flags & O_WRONLY || flags & O_RDWR) fi->writable = 1;
+
+ pthread_mutex_init(&fi->mutex, NULL);
+
+ pthread_mutex_lock(&files_mutex);
+ fi->next = files;
+ files = fi;
+ pthread_mutex_unlock(&files_mutex);
+
+ fi->ref = 1;
+
+ return fi;
+
+fail:
+
+ if (req)
+ ne_request_destroy(req);
+
+ if (length)
+ free(length);
+
+ if (fi) {
+ if (fi->fd >= 0)
+ close(fi->fd);
+ free(fi->filename);
+ free(fi);
+ }
+
+ return NULL;
+}
+
+static int load_up_to_unlocked(struct file_info *fi, off_t l) {
+ ne_content_range range;
+ assert(fi);
+ ne_session *session;
+
+ if (!(session = session_get())) {
+ errno = EIO;
+ return -1;
+ }
+
+ if (l > fi->server_length)
+ l = fi->server_length;
+
+ if (l <= fi->present)
+ return 0;
+
+ if (lseek(fi->fd, fi->present, SEEK_SET) != fi->present)
+ return -1;
+
+ range.start = fi->present;
+ range.end = l-1;
+
+ if (ne_get_range(session, fi->filename, &range, fi->fd)) {
+ fprintf(stderr, "GET failed: %s\n", ne_get_error(session));
+ errno = ENOENT;
+ return -1;
+ }
+
+ fi->present = l;
+ return 0;
+}
+
+int file_cache_read(void *f, char *buf, size_t size, off_t offset) {
+ struct file_info *fi = f;
+ ssize_t r = -1;
+
+ assert(fi && buf && size);
+
+ pthread_mutex_lock(&fi->mutex);
+
+ if (load_up_to_unlocked(fi, offset+size) < 0)
+ goto finish;
+
+ if ((r = pread(fi->fd, buf, size, offset)) < 0)
+ goto finish;
+
+finish:
+
+ pthread_mutex_unlock(&fi->mutex);
+
+ return r;
+}
+
+int file_cache_write(void *f, const char *buf, size_t size, off_t offset) {
+ struct file_info *fi = f;
+ ssize_t r = -1;
+
+ assert (fi);
+
+ pthread_mutex_lock(&fi->mutex);
+
+ if (!fi->writable) {
+ errno = EBADF;
+ goto finish;
+ }
+
+ if (load_up_to_unlocked(fi, offset) < 0)
+ goto finish;
+
+ if ((r = pwrite(fi->fd, buf, size, offset)) < 0)
+ goto finish;
+
+ if (offset+size > fi->present)
+ fi->present = offset+size;
+
+ if (offset+size > fi->length)
+ fi->length = offset+size;
+
+ fi->modified = 1;
+
+ r = 0;
+
+finish:
+ pthread_mutex_unlock(&fi->mutex);
+
+ return r;
+}
+
+int file_cache_truncate(void *f, off_t s) {
+ struct file_info *fi = f;
+ assert(fi);
+ int r;
+
+ pthread_mutex_lock(&fi->mutex);
+
+ fi->length = s;
+ r = ftruncate(fi->fd, fi->length);
+
+ pthread_mutex_unlock(&fi->mutex);
+
+ return r;
+}
+
+int file_cache_sync_unlocked(struct file_info *fi) {
+ int r = -1;
+ ne_session *session;
+ assert(fi);
+
+ if (!(session = session_get())) {
+ errno = EIO;
+ goto finish;
+ }
+
+ if (!fi->writable) {
+ errno = EBADF;
+ goto finish;
+ }
+
+ if (!fi->modified) {
+ r = 0;
+ goto finish;
+ }
+
+ if (load_up_to_unlocked(fi, (off_t) -1) < 0)
+ goto finish;
+
+ if (lseek(fi->fd, 0, SEEK_SET) == (off_t)-1)
+ goto finish;
+
+
+ if (ne_put(session, fi->filename, fi->fd)) {
+ fprintf(stderr, "PUT failed: %s\n", ne_get_error(session));
+ errno = ENOENT;
+ goto finish;
+ }
+
+ stat_cache_invalidate(fi->filename);
+ dir_cache_invalidate_parent(fi->filename);
+
+ r = 0;
+
+finish:
+
+ return r;
+}
+
+int file_cache_sync(void *f) {
+ struct file_info *fi = f;
+ int r = -1;
+ assert(fi);
+
+ pthread_mutex_lock(&fi->mutex);
+ r = file_cache_sync_unlocked(fi);
+ pthread_mutex_unlock(&fi->mutex);
+
+ return r;
+}
+
+int file_cache_close_all(void) {
+ int r = 0;
+
+ pthread_mutex_lock(&files_mutex);
+
+ while (files) {
+ struct file_info *fi = files;
+
+ pthread_mutex_lock(&fi->mutex);
+ fi->ref++;
+ pthread_mutex_unlock(&fi->mutex);
+
+ pthread_mutex_unlock(&files_mutex);
+ file_cache_close(fi);
+ file_cache_unref(fi);
+ pthread_mutex_lock(&files_mutex);
+ }
+
+ pthread_mutex_unlock(&files_mutex);
+
+ return r;
+}